DiMarco started four of the five games he played in last season, but was made expendable when the Chiefs drafted fullback Braden Wilson last weekend and then traded cornerback Javier Arenas to the Arizona Cardinals for another fullback, Anthony Sherman.

Greenwood played 48 games for the Chiefs over the past three seasons, primarily on special teams, while Mattison played 19 games over three seasons in Kansas City, St. Louis and Baltimore.